tourmaline

3 ENTRIES FOUND:

tour·ma·line

noun \ˈtr-mə-lən, -ˌlēn\

Definition of TOURMALINE

:  a mineral of variable color that consists of a complex borosilicate and is valued as a gem when transparent and cut

Origin of TOURMALINE

Sinhalese toramalli carnelian
First Known Use: 1759

Other Mineralogy Terms

agate, host, inclusion, matrix, streak

tourmaline

noun    (Concise Encyclopedia)

Complex silicate mineral that is often used as a gemstone. Three types of tourmaline, distinguished by the presence of certain elements, are usually recognized: iron tourmaline (schorl) is black, magnesium tourmaline (dravite) is brown, and alkali tourmalines may be pink, green, blue, or colourless. Tourmaline is most common in granite pegmatites. Gem-quality stones are found especially in the U.S., Brazil, Russia, and Madagascar.

Browse

Next Word in the Dictionary: tourmaline pink
Previous Word in the Dictionary: tourlourou
All Words Near: tourmaline

Seen & Heard

What made you want to look up tourmaline? Please tell us where you read or heard it (including the quote, if possible).

Get Our Free Apps
Voice Search, Favorites,
Word of the Day, and More
Join Us on FB & Twitter
Get the Word of the Day and More